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commandlinefu.com is the place to record those command-line gems that you return to again and again.

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If you have ever edited a locally checked out version of a file to tweak it for testing purposes, and came back to it over a weekend, you might have forgotten what you exactly changed. This command helps you see the differences between the the checked in SVN version, and the one you tweaked.

This will extract the differing CSS entries of two files. I've left the initial character (plus or space) in output to show the real differing line, remove the initial character to get a working CSS file. The output CSS file is usable by either adding it in a below the to original.css, or by only using the output but adding @import url("original.css"); in the beginning.

This is very useful for converting Wordpress theme copies into real Wordpress child themes.

Could exclude common lines within entries too, I guess, but that might not be worth the complexity.

# Standard diff output...
Using <(command_here) will do the same job as "command_here > command_output" and then use command_output instead of <(command_here).
This trick can be used for much more than diff as the command that get this as a parameter wont see the different between the <( ) file descriptor and a normal file.
Eg: diff /etc/passwd <(ssh remotehost "cat /etc/passwd")
ls <(ls), will give you a little hint why this works :)